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Note 4 - Cash and Cash Equivalents and Short-term Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Cash, Cash Equivalents and Short-term Investments [Table Text Block] |
|  | As of December 31, 2012 |
|  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Gross Unrealized Gains (pre-tax) |  |  | Gross Unrealized Losses (pre-tax) |
Mutual funds |  | $ | 27,582 |  |  | $ | 27,582 |  |  | $ | -- |  |  | $ | 337 |  |  | $ | 9 |
Municipal bonds |  |  | 21,629 |  |  |  | -- |  |  |  | 21,629 |  |  |  | 862 |  |  |  | 128 |
Total securities available-for-sale |  | $ | 49,211 |  |  | $ | 27,582 |  |  | $ | 21,629 |  |  | $ | 1,199 |  |  | $ | 137 |
|  | As of December 31, 2011 |
|  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Gross Unrealized Gains (pre-tax) |  |  | Gross Unrealized Losses (pre-tax) |
Mutual funds |  | $ | 24,851 |  |  | $ | 24,851 |  |  | $ | -- |  |  | $ | 383 |  |  | $ | -- |
Municipal bonds |  |  | 20,004 |  |  |  | -- |  |  |  | 20,004 |  |  |  | 617 |  |  |  | 15 |
Total securities available-for-sale |  | $ | 44,855 |  |  | $ | 24,851 |  |  | $ | 20,004 |  |  | $ | 1,000 |  |  | $ | 15 |

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- Definition No authoritative reference available. + References No definition available. + Details
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